diff --git a/CHANGELOG.md b/CHANGELOG.md
index 44d2f3b3..0ac6718c 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,12 @@
 
 ## [Unreleased]
 
+## [v1.12.3] - 2024-06-20
+
+### Fixed
+
+-   Updated direct access to constructor prototype props to class props to make sure minification with keepClass attributes doesn't affect conversion.
+
 ## [v1.12.2] - 2024-05-21
 
 ### Fixed
@@ -106,7 +112,9 @@ Newer releases follow the [Keep a Changelog](https://keepachangelog.com) format.
 -   Stable release
 -   Removed libxmljs from package.json
 
-[Unreleased]: https://github.com/postmanlabs/wsdl-to-postman/compare/v1.12.2...HEAD
+[Unreleased]: https://github.com/postmanlabs/wsdl-to-postman/compare/v1.12.3...HEAD
+
+[v1.12.3]: https://github.com/postmanlabs/wsdl-to-postman/compare/v1.12.2...v1.12.3
 
 [v1.12.2]: https://github.com/postmanlabs/wsdl-to-postman/compare/v1.12.1...v1.12.2
 
diff --git a/lib/security/schemas/inputs/tokens/SAMLTokenInput.js b/lib/security/schemas/inputs/tokens/SAMLTokenInput.js
index 7d24f9e9..a097280a 100644
--- a/lib/security/schemas/inputs/tokens/SAMLTokenInput.js
+++ b/lib/security/schemas/inputs/tokens/SAMLTokenInput.js
@@ -1,5 +1,6 @@
 class SAMLTokenInput {
   constructor() {
+    this.constructor_name = 'SAMLTokenInput';
     this.includeToken = '';
     this.issuerInfo = '';
     this.claims = '';
diff --git a/lib/security/schemas/inputs/tokens/UsernameTokenInput.js b/lib/security/schemas/inputs/tokens/UsernameTokenInput.js
index cab09293..8dac0203 100644
--- a/lib/security/schemas/inputs/tokens/UsernameTokenInput.js
+++ b/lib/security/schemas/inputs/tokens/UsernameTokenInput.js
@@ -1,5 +1,6 @@
 class UsernameTokenInput {
   constructor() {
+    this.constructor_name = 'UsernameTokenInput';
     this.includeToken = '';
     this.issuerInfo = '';
     this.claims = '';
diff --git a/lib/security/schemas/inputs/transport/TransportBindingInput.js b/lib/security/schemas/inputs/transport/TransportBindingInput.js
index a762181c..34cbf281 100644
--- a/lib/security/schemas/inputs/transport/TransportBindingInput.js
+++ b/lib/security/schemas/inputs/transport/TransportBindingInput.js
@@ -1,5 +1,6 @@
 class TransportBindingInput {
   constructor() {
+    this.constructor_name = 'TransportBindingInput';
     this.transportToken = '';
     this.algorithmSuite = '';
     this.layout = '';
diff --git a/lib/utils/SOAPHeader.js b/lib/utils/SOAPHeader.js
index 1eb71a7d..f6bc76ac 100644
--- a/lib/utils/SOAPHeader.js
+++ b/lib/utils/SOAPHeader.js
@@ -158,7 +158,7 @@ class SOAPHeader {
       'TransportBindingInput': this.processSSLTransport,
       'SAMLTokenInput': this.processSAMLToken
     };
-    return handlers[element.constructor.name];
+    return handlers[element.constructor_name];
   }
 
   /**
diff --git a/package-lock.json b/package-lock.json
index 5cf22a0e..f774cd61 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "@postman/wsdl-to-postman",
-  "version": "1.12.2",
+  "version": "1.12.3",
   "lockfileVersion": 2,
   "requires": true,
   "packages": {
     "": {
       "name": "@postman/wsdl-to-postman",
-      "version": "1.12.2",
+      "version": "1.12.3",
       "license": "Apache-2.0",
       "dependencies": {
         "ajv": "8.1.0",
diff --git a/package.json b/package.json
index 74def4b7..5629bf44 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@postman/wsdl-to-postman",
-  "version": "1.12.2",
+  "version": "1.12.3",
   "description": "Convert a given WSDL specification (1.1) to Postman Collection",
   "main": "index.js",
   "bin": {